Air Conditioning (A/C) Diagnostics - Pressure Zone B. Oldsmobile Aurora 2003

For 1990-2009 cars only

Makes 🢒 Oldsmobile 🢒 2003 🢒 Aurora 🢒 HVAC 🢒 Heating, Ventilation and Air Conditioning 🢒 Air Conditioning (A/C) Diagnostics - Pressure Zone B

Step

Action

Yes

Were you sent here from the A/C System Performance Test?

Go to Step 2

Go to Air Conditioning (A/C) System Performance Test

After continued operation of the A/C system, do the low and high side pressures equalize or become static?

Go to Step 5

Go to Step 3

Refer to the pressures recorded during the A/C System Performance Test.

Inspect for the following conditions:

Caution: Refer to Moving Parts and Hot Surfaces Caution in the Preface section.

•	The low side pressure equal to or above the specified pressure range of the A/C Performance Table. Refer to Air Conditioning (A/C) System Performance Test .

•	The high side pressure is below the specified pressure range of the A/C Performance Table. Refer to Air Conditioning (A/C) System Performance Test .

•	The low side refrigerant line at the compressor feels cool-to-warm.

•	The high side refrigerant line at the compressor feels warm-to-hot.

Do the listed conditions exist?

Go to Step 5

Go to Step 4

Refer to the pressures recorded during the A/C System Performance Test.

Inspect for the following conditions:

•	The low side pressure is above the specified pressure range of the A/C Performance Table. Refer to Air Conditioning (A/C) System Performance Test .

•	The high side pressure is below the specified pressure range of the A/C Performance Table. Refer to Air Conditioning (A/C) System Performance Test .

•	The low side refrigerant line at the compressor feels warm.

•	The high side refrigerant line at the compressor feels warm to hot.

Do the listed conditions exist ?

Go to Step 5

Go to Air Conditioning (A/C) System Performance Test

The A/C system has a low refrigerant charge.

Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging .

Is the procedure complete?

Go to Step 6

Record the low and high side pressures as well as the IP outlet air temperature after repairs are performed.
Compare the pressures and outlet temperature to those listed in the A/C Performance Chart. Refer to Air Conditioning (A/C) System Performance Test .

Are the readings within the specified ranges?

Go to Step 13

Go to Step 7

The A/C compressor is malfunctioning.

Remove the expansion device and inspect for contamination. Refer to Orifice Solenoid Replacement .

Are there metal flakes on the expansion device?

Go to Step 9

Go to Step 8

Inspect the expansion device for a brown, powdery residue indicating desiccant in the A/C system.

Is there a brown, powdery residue present?

Go to Step 11

Go to Step 12

Remove the discharge hose from the compressor. Refer to Discharge Hose Replacement .
Inspect for metal flake contamination at the line connections and the compressor ports.

Is there metal flake contamination present?

Go to Step 10

Replace the A/C compressor. Refer to Air Conditioning Compressor Replacement .
Replace the orifice tube. Refer to Orifice Solenoid Replacement .
Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging .

Is the repair complete?

Go to Step 13

Flush the A/C system. Refer to the J 43600 Operation Manual.
Replace the orifice tube. Refer to Orifice Solenoid Replacement .
Replace the A/C compressor. Refer to Air Conditioning Compressor Replacement .
Replace the accumulator. Refer to Air Conditioning Accumulator Replacement .
Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging .

Is the repair complete?

Go to Step 13

Replace the A/C compressor. Refer to Air Conditioning Compressor Replacement .
Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging .

Is the repair complete?

Go to Step 13

Operate the system in order to verify the repair

Did you find and correct the condition?

System OK

Go to Symptoms - HVAC Systems - Automatic